not fully related but i was doing some reading on various "new sustainable ways of transportation" and, since they're building the biggest hyperloop test track

not fully related but i was doing some reading on various "new sustainable ways of transportation" and, since they're building the biggest hyperloop test track near my place, i found this interesting video of some of problems one might get trying to put vacuum in a pipe: https://youtu.be/Zz95_VvTxZM https://youtu.be/Zz95_VvTxZM